JP2547803Y2 - Mobile crane hook block - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing swinging of a hook block and a trunnion when a hook block is stored in a mobile crane.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS. The mobile crane has a hook block 5 which can be freely lifted and suspended via a wire rope 4 passing through a boom tip pulley 3 provided at a goose neck portion 2 at the tip of a boom 1, and the hook block 5 is a sheave having a side plate 6 and a pulley. Block 7,
A trunnion 8 is pivotally attached to the lower end of the side plate 6 at the lower side of the sheave block 7 and a hook 9 pivotally attached to the trunnion 8. Then, the mobile crane during traveling travels and retracts the hook block 5 so as to prevent the hook block 5 from swinging, so that the hook block 5 does not collide with other objects or obstruct the view. .

As shown in FIG. 3, a hook block storage arm which is swingably attached to the gooseneck portion 2 when the hook block 5 is wound around the sheave block 7.
A pressing member 10 is attached to the lower end of the pressing member 11 so as to be abutted and pressed down. When the pressing member 10 is pressed down, the engaging portion at the lower end of the pressing member 10 engages with the trunnion 8 or the hook 9. There are those that have been configured. Here, the hook block storage arm 11 is a hook block storage arm.
The lower end of 11 is the side plates 6 of the hook block 5 and the pressing member
It has a width (perpendicular to the paper) that makes contact with the upper end of 10.

With this structure, the hook block 5 is wound up, and the side plate 6 and the pressing member 10 are attached to the lower end of the hook block storage arm 11 which is swingably attached to the gooseneck portion 2.
, The hook block 5 can be prevented from swinging, and the engaging portion at the lower end of the pressing member 10 can be engaged with the trunnion 8 or the hook 9 to prevent the trunnion 8 from swinging. it can.

FIGS. 4 and 5 show another conventional technique.
There is a structure shown in FIG. When the hook block 12 is wound up, a pressing member 14 is attached to the sheave block 7 and is pushed downward by abutting against a lower end of a hook block storage arm 16 swingably attached to the gooseneck portion 2. When pressed down, the engaging portion at the lower end of the pressing member 14 is configured to engage with the trunnion 8 or the hook 9. Here, the hook block storage arm 16 is configured such that the lower end of the hook block storage arm 16 is guided by the guide hole 15 of the hook block 12 and abuts on the upper end of the pressing member 10 and has a width (perpendicular to the plane of FIG. 4). Direction) is small and is located in a space surrounded by the wire rope 4.

With this structure, the hook block 12 is wound up and the pressing member 14 is brought into contact with the lower end of the hook block storage arm 16 in the same manner as shown in FIG. The joint portion engages with the trunnion 8 or the hook 9 to prevent the trunnion 8 from swinging, and the goose neck portion 2 and the hook block.
Since the wire rope 4 is placed in a tensioned state with the hook block storage arm 16 interposed between the hook blocks 12, the hook block 12 can be prevented from swinging.

[0007]

According to the prior art,
By winding up the hook blocks 5 and 12 and pressing the pressing members 10 and 14 against the lower ends of the hook block storing arms 11 and 16, the swinging of the hook blocks 5 and 12 is prevented and the lower ends of the pressing members 10 and 14 are formed. Engagement part or this pressing member
An engaging member interlockingly connected to the hooks 10 and 14 can be engaged with the trunnion 8 or the hook 9 to prevent the trunnion 8 from swinging. However, the present invention is applied to a hook block having a pulley above the hook 9. In this case, there are the following problems.

In the structure shown in FIG. 3, the hook block storage arm 11 has a width (the direction perpendicular to the plane of the paper) such that the lower end of the hook block storage arm 11 abuts against the both side plates 6 of the hook block 5 and the upper end of the pressing member 10. )
There has been a problem that interference between the hook block storage arm 11 and other components is likely to occur, and this is an obstacle to miniaturization.
In the structure shown in FIGS. 4 and 5, since the pressing member 14 must be positioned so as to avoid the pulley, the hook block storage arm 16 which abuts on the pressing member 14 has the center of gravity of the hook block 12 on the center line of the hook 9. As a result, the hook block 12 is tilted, so that the swing of the hook block 12 and the swing of the trunnion 8 cannot be stably prevented.

It is an object of the present invention to solve the above two problems applicable to a hook block having a pulley above the hook 8 and a small mobile crane capable of reliably preventing the swing of the trunnion 8 and the hook block. Is to provide a hook block.

[0010]

SUMMARY OF THE INVENTION A hook block of a mobile crane according to the present invention is a hook that can be lifted up and down freely via a wire rope passing through a boom tip pulley provided at a goose neck portion at the boom tip of the mobile crane. A block, in particular, a sheave block having a side plate, a pulley, a trunnion below the sheave block and pivotally mounted to the lower end of the side plate, and a hook pivotally mounted on the trunnion. A hook block, comprising: a sheave block, which is pressed down when it is wound on a sheave block and abuts against a lower end of the goose neck portion or a lower end of a hook block storage arm swingably attached to the goose neck portion. Attach the member, and when the pressing member is pressed down, the lower end of the pressing member In the hook block of the mobile crane configured to engage with the trunnion or the hook, the engaging member interlockingly connected to the engaging portion or the pressing member, and to prevent the trunnion from swinging, at least above the hook A single pulley is arranged, and a guide hole for guiding the hook block storage arm above the pulley is arranged such that the hook block storage arm, the pulley, and the hook are aligned in a front view and a side view when the hook block is wound up. The pressing member is disposed on the side of the pulley, and a receiving member is provided at the upper end of the pressing member, the receiving member being in contact with the lower end of the hook block storage arm guided by the guide hole. It is configured as a feature.

[0011]

When the traveling state is set, the wire rope 4
Wind up the hook block, gooseneck part 2
A pressing member is brought into contact with the lower end of the arm or the lower end of the hook block storage arm 16 which is swingably attached to the gooseneck portion 2. The engaging portion at the lower end of the pressing member pressed down or the engaging member interlockingly connected to the pressing member engages the trunnion 8 or the hook 9. The engagement prevents the trunnion 8 from swinging, and the vehicle enters a traveling state.
When the crane is in the working state, the wire rope 4 is lowered to lower the hook block, and the hook block is in contact with the lower end of the gooseneck portion 2 or the lower end of the hook block storage arm 16 swingably attached to the gooseneck portion 2. Release the hook block and the pressing member. The engagement between the engaging portion at the lower end of the pressing member that has been pushed down or the engaging member interlockingly connected to the pressing member and the trunnion 8 or the hook 9 is released. The swing of the trunnion 8 becomes free, and the crane can be freely operated.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 and FIG. Reference numerals 1-4, 8- shown and described in FIGS.
9 and 16 are synonymous and will not be described. 21 is
Hook block, 22 is a sheave block, 22a is a pulley, 23 is a pressing member, 24 is a pin, 25 is a receiving member, 26
Is an engaging portion, 27 is a guide hole, 28 is a connecting plate, and 29 is a spring. The hook block 21 includes a side plate 13, a sheave block 22, a trunnion 8, a hook 9, a pressing member 23, a pin 24,
It comprises a guide hole 27, a connecting plate 28, and a spring 29. The sheave block 22 has at least one pulley above the hook 9
22a is arranged and has a pin bridged between the side plates 13, 13 and is supported by this pin. Pressing member 23
Is rotatably supported by a pin 24 on the side of the pulley 22a, a receiving member 25 is provided at an upper end of the pressing member 23, and an engaging portion 26 is provided at a lower end of the pressing member 23. I have. The guide hole 27 is provided above the pulley 22a and above the center of gravity of the hook block 21. In the present embodiment, the guide hole 27 is pivotally supported by the sheave block 22, and the rotation connects the side plates 13, 13. It is blocked by the connecting plate 28. The receiving member 25 of the pressing member 23 is arranged such that the lower end of the hook block storage arm 16 guided by the guide hole 27 abuts, and the engaging portion 26 of the pressing member 23 is rotated by the pressing member 23 being pressed down by the abutting. When it moves, it engages with the trunnion 8 or the hook 9. The spring 29 urges the engaging portion 26 of the pressing member 23 so as not to always engage with the trunnion 8 or the hook 9.

The operation will be described. When moving to the traveling state, wind up the wire rope 4 and
Wind up 21. The lower end of the hook block storage arm 16 swingably attached to the gooseneck part 2 is guided by the guide hole 27 and abuts on the receiving member 25 of the pressing member 23. The receiving member 25 abutting on the lower end of the hook block storage arm 16 is
The contact force overcomes the biasing force of the spring 29 and is pressed down,
The pressing member 23 and the engaging portion 26 of the pressing member 23 are rotated around 24. The rotated engaging portion 26 is engaged with the trunnion 8 or the hook 9. Thus, the vehicle is in a traveling state. The hook block storage arm 16 that contacts the pressing member 23 is the hook 9
Since the hook block 21 is not tilted because it presses on the center line of the hook block 21 on the center line of the hook block 21,
The swing of the trunnion 8 and the swing of the trunnion 8 can be stably prevented.

In this embodiment, the lower end of the engaging portion 26 is engaged with the upper surface of the trunnion 8 and the side surface on the hook 9 side is
, The swing of the trunnion 8 and the turning of the hook 9 can be prevented. Further, since the wire rope 4 is placed in a tensioned state with the hook block storage arm 16 interposed between the gooseneck portion 2 and the hook block 21, the swing of the hook block 12 can be prevented.

When the crane is in the working state, the wire rope 4 is lowered and the hook block 21 is lowered. When the lower end of the hook block storage arm 16 that comes into contact with the receiving member 25 comes off, the urging force of the spring 29 rotates the pin 24 around the pressing member 23 and the original position of the engaging portion 26F. The engagement between the portion 26 and the trunnion 8 or the hook 9 is released. When the hook block 21 is further lowered,
The lower end of the hook block storage arm 16 is pulled out of the guide hole 27. The hook block 21 can swing freely, the swing of the trunnion 8 and the swing of the hook 9 also become free,
The crane works.

[0016]

[Effects of the Invention] The storage and swing prevention of the hook block and the swing prevention of the trunnion in the hook block having the pulley above the hook are ensured by a simple operation of winding the hook block without increasing the size of the device. Therefore, it is very effective in simplifying work and improving safety.

[Brief description of the drawings]

FIG. 1 is a side view of a hook block of the mobile crane according to the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is an explanatory view showing a hook block of a conventional mobile crane.

FIG. 4 is an explanatory diagram showing another example of the related art.

FIG. 5 is a front view of the hook block of FIG. 4;

[Explanation of symbols]

 8 trunnion 9 hook 16 hook block storage arm 21 hook block 22 sheave block 22a pulley 23 pressing member 25 receiving member 26 engaging portion 27 guide hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A hook block which can be hung up and down freely via a wire rope passing through a boom tip pulley provided at a goose neck portion at a boom tip of a mobile crane,
In particular, it is constituted by a side plate, a sheave block having a pulley, a trunnion below the sheave block and pivotally mounted to the lower end of the side plate, and a hook rotatably mounted on the trunnion. A hook block, wherein the sheave block is provided with a pressing member which is pressed down when the hook block is rolled up, and which is brought into contact with a lower end of the goose neck portion or a lower end of a hook block storage arm swingably attached to the goose neck portion. When the pressing member is pressed down, the engaging portion at the lower end of the pressing member or the engaging member interlockingly connected to the pressing member engages the trunnion or the hook, and swings the trunnion. In a mobile crane hook block configured to block, at least one piece above the hook A pulley is arranged, and a guide hole for guiding the hook block storage arm above the pulley is provided.When the hook block is wound up, the hook block storage arm, the pulley,
A hook that is arranged on the hook block so that the hook is positioned on a straight line, the pressing member is arranged on the side of the pulley, and a stopper that contacts the lower end of the hook block storage arm guided by the guide hole at the upper end of the pressing member. A hook block for a mobile crane, wherein members are attached.